Breach is an alternative game mode in Deus Ex: Mankind Divided. It is set in the virtual world of the Neural SubNet, but the augmentations and weapons used in this game mode are largely the same as Adam Jensen's.
The System Rift expansion mission serves as its prologue.
A hacker called ShadowChild sends out a message to other hackers, telling them that a "breach" in security of the Palisade Blade's has emerged. She urges these hackers which she calls "rippers" to take advantage of this weakness while they have the chance, to extract data from the Palisade servers.
The objective of a map in Breach is to capture servers and download the information from them until you reach the minimum amount needed for that map. Once the minimum amount of data is reached or exceeded, you have to escape before the timer runs out. There are various security features that you must get around, including cameras, humanoid guards, and turrets.